Ok, found out how to auto register Divx Tools Used: Total Uninstall (for installation/registry monitoring) Autoit (to auto accept terms agreement window on setup) Method: Apply 2 registry entries before installing and copy over file created at registration time before installation as well. =Make sure to install and register Divx first= First (registry)- HKEY_LOCAL_MACHINE\SOFTWARE\Protexis (export that entire key into a reg file) Second (registry)- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\RNG (export that whole key and put that in your reg as well) Third (file copy)- File "KGyGaAvL.SYS" that is created by Divx in your system32 dir. It is a hidden system file. After registering and installing divx, take this file and put in your setup dir on the cd. This file must be copied over to system32 before installation. Fourth (Setup)- For my version of Divx, I used the /S install option, however a terms agreement window still opens at the start, so I used "Autoit" to create a script to auto hit the spacebar to bypass it.